Originally Posted By: Jagermeister
For most part Americans to not true Vo for testing and publishing velocities therefore to obtain actual muzzle velocity 75fps to 100fps must be added to what is printed on the American-made cartridge box.


If you're speaking about true MV--measured at the muzzle--versus the figure furnished by American ammo manufacturers, that's an accurate observation. For example, from John Taylor's very handy book "Shotshells and Ballistics", the 1 1/4 oz load of American 5's or 6's, long the standard for "rough shooting" (walking up pheasants over dogs), measures 1330 fps at 3 feet. At the muzzle, it's 1436 fps. Thus, not much different from the Hull High Pheasant load in terms of velocity.